Domicile is used to determine the foreign (non-U.S. addressee) or domestic (U.S. addressee) status of a customer of the reporting bank for the purposes of these reports. Domicile is determined by the principal residence address of an individual or the principal business address of a corporation, partnership, or sole proprietorship. If other addresses are used for correspondence or other purposes, only the principal address, insofar as it is known to the reporting bank, should be used in determining whether a customer should be regarded as a U.S. or non-U.S. addressee.
For purposes of defining customers of the reporting bank, U.S. addressees include residents of the 50 states of the United States, the District of Columbia, Puerto Rico, and U.S. territories and possessions. Non-U.S. addressees includes residents of any foreign country. The term non-U.S. addressee generally includes foreign-based subsidiaries of other U.S. banks.
For customer identification purposes, the IBFs of other U.S. depository institutions are U.S. addressees. (This is in contrast to the treatment of the IBFs of the reporting bank, which are treated as foreign offices of the reporting bank.)


reference: FFIEC